Nutrient level
I just sprout lettuce on 1" grow blocks on a tray Wet it and drain once or twice daily.. once I get roots I put then in 4" netpots
If there is no oxygen to the roots plants will die.. if they are soaked then you may need an aerator. this is called deep water culture or dwc
I use eeb and flow on my outdoor systems.. The roots are submerged and drained about 4 times a day
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